I ask you the same question, other parts of world except the saudia, did they ever had 28 days? I am following moon for decades, it never happened.
Previous years, Saudi supreme court had asked its citizens to look for moon on 28th, quoting, possibility exists for error of previous month's sighting. but we have never heard in another parts of world, authorities corrected or requested for 28th moon sighting.
What saudi follows is an OFFSET of one day in their region and the region east to it. This offset continues till they follow real criteria for beginning the month.
There is coastal region in India, Kerala, Ramadhan started a day earlier than other parts of India. But except for a few areas of kerala which follow saudi, others in Kerala completed 30 days and had eid on monday.